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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH v4 5/7] arch: provide thread-local storage helper functions
Because the layout of the TLS area is architecture-specific, we provide
helper functions to get the required size and alignment of the TLS area,
as well as a help function that does the actual copying of the TLS
"master copy" according the layout required by the ABI.
Only the x86-64 implementation is complete and tested. Arm32 is pure
boilerplate. Arm64 has some rough guesses about how the layout should
look like, but is untested.
Signed-off-by: Florian Schmidt <florian.schmidt@xxxxxxxxx>
Reviewed-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
arch/arm/arm/include/uk/asm/tls.h | 62 ++++++++++++++++++++++++
arch/arm/arm64/include/uk/asm/tls.h | 72 ++++++++++++++++++++++++++++
arch/x86/x86_64/include/uk/asm/tls.h | 68 ++++++++++++++++++++++++++
include/uk/arch/tls.h | 40 ++++++++++++++++
plat/kvm/arm/link64.lds.S | 2 +
plat/xen/arm/link32.lds.S | 2 +
6 files changed, 246 insertions(+)
create mode 100644 arch/arm/arm/include/uk/asm/tls.h
create mode 100644 arch/arm/arm64/include/uk/asm/tls.h
create mode 100644 arch/x86/x86_64/include/uk/asm/tls.h
create mode 100644 include/uk/arch/tls.h
diff --git a/arch/arm/arm/include/uk/asm/tls.h
b/arch/arm/arm/include/uk/asm/tls.h
new file mode 100644
index 00000000..67d6f264
--- /dev/null
+++ b/arch/arm/arm/include/uk/asm/tls.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UKARCH_TLS_H__
+#error Do not include this header directly
+#endif
+
+#error Thread-local storage not implemented for arm32!
+
+#include <uk/arch/types.h>
+
+extern char _tls_start[], _etdata[], _tls_end[];
+
+static inline __sz ukarch_tls_area_size(void)
+{
+ return 0;
+}
+
+static inline __sz ukarch_tls_area_align(void)
+{
+ return 1;
+}
+
+static inline void ukarch_tls_copy(void *tls_area)
+{
+}
+
+static inline void *ukarch_tls_pointer(void *tls_area)
+{
+ return NULL;
+}
diff --git a/arch/arm/arm64/include/uk/asm/tls.h
b/arch/arm/arm64/include/uk/asm/tls.h
new file mode 100644
index 00000000..829334e7
--- /dev/null
+++ b/arch/arm/arm64/include/uk/asm/tls.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UKARCH_TLS_H__
+#error Do not include this header directly
+#endif
+
+#warning Thread-local storage has not been tested on aarch64!
+
+#include <uk/arch/types.h>
+#include <string.h>
+
+extern char _tls_start[], _etdata[], _tls_end[];
+
+static inline __sz ukarch_tls_area_size(void)
+{
+ /* aarch64 ABI adds 16 bytes of TCB at the beginning of the TLS area,
+ * followed by the actual TLS data.
+ */
+ return _tls_end - _tls_start + 16;
+}
+
+static inline __sz ukarch_tls_area_align(void)
+{
+ return 8;
+}
+
+static inline void ukarch_tls_area_copy(void *tls_area)
+{
+ __sz tls_data_len = _etdata - _tls_start;
+ __sz tls_bss_len = _tls_end - _etdata;
+
+ memset(tls_area, 0, 16);
+ memcpy(tls_area + 16, _tls_start, tls_data_len);
+ memset(tls_area + tls_data_len + 16, 0, tls_bss_len);
+}
+
+static inline void *ukarch_tls_pointer(void *tls_area)
+{
+ return tls_area;
+}
diff --git a/arch/x86/x86_64/include/uk/asm/tls.h
b/arch/x86/x86_64/include/uk/asm/tls.h
new file mode 100644
index 00000000..70bbc1d1
--- /dev/null
+++ b/arch/x86/x86_64/include/uk/asm/tls.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UKARCH_TLS_H__
+#error Do not include this header directly
+#endif
+
+#include <uk/arch/types.h>
+#include <string.h>
+
+extern char _tls_start[], _etdata[], _tls_end[];
+
+static inline __sz ukarch_tls_area_size(void)
+{
+ /* x86_64 ABI requires that fs:%0 contains the address of itself, to
+ * allow certain optimizations. Hence, the overall size of the size of
+ * the TLS area, plus 8 bytes.
+ */
+ return _tls_end - _tls_start + 8;
+}
+
+static inline __sz ukarch_tls_area_align(void)
+{
+ return 8;
+}
+
+static inline void ukarch_tls_area_copy(void *tls_area)
+{
+ __sz tls_len = _tls_end - _tls_start;
+ __sz tls_data_len = _etdata - _tls_start;
+ __sz tls_bss_len = _tls_end - _etdata;
+
+ memcpy(tls_area, _tls_start, tls_data_len);
+ memset(tls_area + tls_data_len, 0, tls_bss_len);
+ /* x86_64 ABI requires that fs:%0 contains the address of itself. */
+ *((__uptr *)(tls_area + tls_len)) = (__uptr)(tls_area + tls_len);
+}
diff --git a/include/uk/arch/tls.h b/include/uk/arch/tls.h
new file mode 100644
index 00000000..bfbcd5fc
--- /dev/null
+++ b/include/uk/arch/tls.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UKARCH_TLS_H__
+#define __UKARCH_TLS_H__
+
+#include <uk/asm/tls.h>
+
+#endif /* __UKARCH_TLS_H__ */
diff --git a/plat/kvm/arm/link64.lds.S b/plat/kvm/arm/link64.lds.S
index 753d1696..d08abe48 100644
--- a/plat/kvm/arm/link64.lds.S
+++ b/plat/kvm/arm/link64.lds.S
@@ -103,6 +103,8 @@ SECTIONS {
_ectors = .;
. = ALIGN(__PAGE_SIZE);
+ TLS_SECTIONS
+
/* Read-write data that is initialized explicitly in code */
_data = .;
.data :
diff --git a/plat/xen/arm/link32.lds.S b/plat/xen/arm/link32.lds.S
index 642b5eb3..cade70a1 100644
--- a/plat/xen/arm/link32.lds.S
+++ b/plat/xen/arm/link32.lds.S
@@ -81,6 +81,8 @@ SECTIONS
. = ALIGN(__PAGE_SIZE);
_ectors = .;
+ TLS_SECTIONS
+
/* Data */
_data = .;
.data : {
--
2.21.0
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